Vortex Attack EX is a high-intensity, retro-style (shmup) developed by Kaleidoscope Games. It is an enhanced version of the original Vortex Attack , featuring:

Vortex Attack EX often receives patches for controller compatibility and bug fixes. Pirated versions are static and won't include the "EX" enhancements or online leaderboard features.

A blend of classic arcade aesthetics with modern particle effects and HD resolutions. Local Co-op: Support for up to 3 players simultaneously.

Check the Steam page or the developer's website; indie shooters often provide a free demo which allows you to experience the core mechanics (the "Vortex" combat) without security risks.